The invention provides a welding compressing tool and relates to the technical field of welding tools. The welding compressing tool comprises a rack, welding compressing units and a positioning unit;the rack is provided with a positioning area; the two sides of the positioning area are oppositely provided with the welding compressing units; each welding compressing unit comprises a moving seat, afirst welding compressing piece and a second welding compressing piece; the moving seats are arranged on the rack and can move in a preset direction; the first welding compressing pieces and the second welding compressing pieces are all arranged on the corresponding moving seats; and the positioning unit is arranged on the rack and enables an electrical core jig to be positioned in the positioning area. By adopting the welding compressing tool provided by the invention, through cooperative matching of the rack, the welding compressing units and the positioning unit, welding work of an electrical core, a copper bar and an FPC can be finished on one tool, so that the compressing efficiency is improved, and the overall production efficiency of a battery is further improved.